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It's official: Smartphones will need to have replaceable batteries by 2027
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
People are gonna hate on this comment but it's true. I can replace the battery in my iPhone in an hour if I want to, even if it's not as easy as it used to be with removable plastic covers on the back of phones.
On the Fairphone everyone can do it, without tools in under 30 seconds. That is replaceable, not having to order equipment and asking your family "IT guy"...
Good luck on waterproofing.